Leases, Commitments and Contingencies - Commitments and Obligations (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating lease payments for aircraft and facility obligations
Apr - Dec 2020	$ 75,137
2021	85,409
2022	75,776
2023	69,623
2024	28,320
Thereafter	100,234
Total	434,499
Firm aircraft and spare engine commitments
Apr - Dec 2020	435,183
2021	274,114
2022	5,500
Total	714,797
Interest commitments
Apr - Dec 2020	88,581
2021	104,678
2022	90,251
2023	73,946
2024	59,373
Thereafter	126,324
Total	543,153
Principal maturities on long-term debt
Apr - Dec 2020	277,692
2021	352,005
2022	365,907
2023	374,906
2024	327,630
Thereafter	1,229,122
Total long-term debt	2,927,262	$ 3,017,523
Total commitments and obligations
Apr - Dec 2020	876,593
2021	816,206
2022	537,434
2023	518,475
2024	415,323
Thereafter	1,455,680
Total	$ 4,619,711

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